1049 Microprocessor Simulation

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**1049 Microprocessor Simulation
**解答例
 import java.util.*;
 
 public class Main {
     public static void main(String[] args) {
         Scanner sc = new Scanner(System.in);
         while(true){
             String input = sc.next();
             if(input.charAt(0)=='8') break;
             Processor proc = new Processor(input);
             proc.execute();
             proc.println();
         }
     }
 }
 
 class Processor{
     int[] mem;
     int pc;
     int rega;
     int regb;
     Processor(String s){
         mem = new int[256];
         for(int i=0;i<256;i++){
             mem[i] = char_to_int(s.charAt(i));
         }
         pc = 0;
         rega = 0;
         regb = 0;
     }
     private static int char_to_int(char c){
         if('0'<=c&&c<='9') return c-'0';
         else/*'A'<=c&&c<='F'*/ return c-'A'+10;
     }
     public void execute(){
         int cnt = 0;
         boolean stop = false;
         while(!stop){
             switch(mem[pc]){
             case 0:
                 rega = mem[mem[pc+1]*16+mem[pc+2]];
                 pc += 3;
                 break;
             case 1:
                 mem[mem[pc+1]*16+mem[pc+2]] = rega;
                 pc += 3;
                 break;
             case 2:
                 rega = rega + regb;
                 regb = rega - regb;
                 rega = rega - regb;
                 pc += 1;
                 break;
             case 3:
                 int sum = rega + regb;
                 rega = sum%16;
                 regb = sum/16;
                 pc += 1;
                 break;
             case 4:
                 rega++;
                 if(rega==16) rega = 0;
                 pc += 1;
                 break;
             case 5:
                 rega--;
                 if(rega==-1) rega = 15;
                 pc += 1;
                 break;
             case 6:
                 if(rega==0) pc = mem[pc+1]*16+mem[pc+2];
                 else pc += 3;
                 break;
             case 7:
                 pc = mem[pc+1]*16+mem[pc+2];
                 break;
             case 8:
                 stop = true;
                 break;
             }
         }
     }
     public void println(){
         char[] output = new char[256];
         for(int i=0;i<256;i++){
             if(mem[i]<=9) output[i] = (char)('0'+mem[i]);
             else output[i] = (char)('A'+mem[i]-10);
         }
         System.out.println(output);
     }
 }